INFLUENCE OF POTASSIUM SPRAYS ON FOLIAR NECROSIS AND YIELDS OF ROMAINE LETTUCE, RADISHES, AND POTATOES

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Abstract
Spraying romaine lettuce with either muriate or sulphate of potash eliminated leaf scorch (leaf breakdown) in six trials and significantly increased the yield of one. In one experiment radishes showed no foliage symptoms, but those sprayed with muriate of potash gave significantly higher yield. Leaf necrosis of Green Mountain potatoes was reduced markedly by potassium sprays in each of 4 years, while yields of U.S. No. 1 tubers were greatly increased in 3 years. Differences between muriate and sulphate of potash were not significant at the concentration used. Potassium sprays during the growing season may be profitable on crops grown in soils deficient in potassium.

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